Seegrotte: Europe's Largest Underground Lake
Discover Europe's largest underground lake at Seegrotte Hinterbrühl, a former mine with a fascinating history and unique boat tours.
Explore the Seegrotte, a former gypsum mine transformed into a mesmerizing underground lake and cave system in Hinterbrühl, near Vienna. Discover its history, from mining operations to a secret WWII aircraft factory, and enjoy a unique boat ride on the emerald-green lake.
A brief summary to Seegrotte
- Grutschgasse 2a, Hinterbrühl, 2371, AT
- +43223626364
- Visit website
- Tuesday 9:30 am-3 pm
- Wednesday 9:30 am-3 pm
- Thursday 9:30 am-3 pm
- Friday 9:30 am-3 pm
- Saturday 9:30 am-4 pm
- Sunday 9:30 am-4 pm
Local tips
- Wear warm clothing and sturdy shoes, as the temperature inside the grotto is a constant 9°C (48°F).
- The tour involves descending stairs, so those with mobility issues should be aware.
- Consider visiting on a weekday or during the off-season to avoid crowds.
- Allow approximately 50 minutes for the guided tour and boat ride.
Getting There
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Public Transport
From Vienna, take a train to Mödling station. From Mödling, take bus line 364 to Hinterbrühl. The bus stop is a short walk from the Seegrotte entrance. A single bus fare from Mödling is approximately €3-€4.
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Car
From Vienna, take the A21 motorway to Hinterbrühl. Follow signs to the Seegrotte. Public parking is available near the entrance, about a 5-minute walk away. Parking is free. Be aware that parking can be limited, especially during peak season.
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